Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a753444fd9e22b5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 07:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66f453fed0a171a2cd6ca774dd310e68 SHA-1: d1a18d5a22204af9905b25241ac485c31610f4f6 SHA-256: 3a753444fd9e22b5b26fb262335c4c7724210ad2e842bae76a072a74b8191896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or redirection, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=real+time+app+android PDF link annotation
    • http://palazzodiaz.com/userfiles/files/gajopufozugidetu.pdfIn PDF document text
    • http://888chji.com/userfiles/files/76500651780.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73f8a5ff5---29543161882.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/56436517087.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/78932863296.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/75409838905.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/45158285975.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131b6b5e13---32448669058.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/rimeb.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/25446116562.pdfIn PDF document text
    • http://badgerhillfarm.uk/10530322715.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/wepudaletaxaz.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/wefigigudurikajeju.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/tozibudalimisak.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/munarimijulipudetonixodet.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hu1i2kefrtdujuos4brevl94dk/8027719646.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/66405844652.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/nesebixetedak.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/97439683919.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bd843384252e08c7e36c778615e3e804/88417149682.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a17798cd8---sefador.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/13635281882.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bajiwupewipusi.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/domir.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/jovigorimunemepalakukezes.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/95849434953.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 17180 bytes
SHA-256: 85d8827193279790d3addca121d188e7dcb90b608652d8e57533d8b7141ea6ff
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10432 bytes
SHA-256: a0a2f69a7964e7165756bb844027211aff7d431a5e251a9151bc0c240e3e18ca
font_02_sfnt_off00013173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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